Impulse emitter



Jan. 13, 1931. A DOMAS HKO 1,788,988

IMPULSE EMITTER Filed April 30, 1927 S Sheets-Sheet J.

J i'gJ fizz/e227? l ndreaslomasc'Zlo, Fee a! 111 15721:: ,70/7101054'0, live/r.

Jan. 13, 1931. V DQMASCHKQ 1,788,988

IMPULSE EMITTER Filed April 30, 1927 s Sheets-Sheet 2 Fig.4

Jan. 13, 1931.

A. DOMASCHKO 1,788,988

IMPULSE EMITI'ER Filed April 30, 192 3 Sheets-Sheet 3 Patented Jan. 13, 1931 nNrTED STATES PATEMY 'P ANnnnAs DOMASCHKO, nnonnsnn, LATE or VIENNA, AUSTRIA, BY ANNA DOMASCEKO,

ADMINISTRATRIX,OF VIENNA, AUSTRIA, ASSIGNOR OF ONE-HALF T CARL EARTH,

0F VIENNA, AUSTRIA.

I PULSE EMITTER Application filed April 30,11927, Serial No. 187,984, and in Austria Majfi, 192s.

This invention relates to impulse emittersend particularly to those eniployedin auto-- matic telephone exchanges I l c The effect to be realized byineans of such iinpulse emitters-consists in alternatelvsend ing' electric impulses into the two branches of the line, which branches might constitute" parts of separate circuits including besldes other connections alsothe eertluin such manner, that the series of the impulses einitted into the one of thesebranches can be varied, this particular latter branch being herein- 7 after called the awire, whilst the other branch is called the b -wire.

The main object of the present inventio 'i is an arrangement owing to which, after certain members determining the number o'f'irnpulses tobe sent consequently as one series into the a-wire have been set accordingly and after the spring driving the apparatus hasbeen wound. up, all the ire-pulses are automatically sent into the b-wire as well as into the a-wire so, that the bin1pul se's will directlvtollowthe a-iinpulses for the purpose of reducing" the to the minimum possible." According to;the invention this is real zed by the feature, that for the emission of the b-impulsesa s well as for that of the a-inipulses separategears are provided, which are mutualhr locking "ancliberating one another.

i inother-object of the invention "is linerphone exchanges with a large "or small n'urn ber of subscribers.

' Another object of the'prese'nt invention is to keep the gears locked until a first group:

selector has been found. so that wrong connections in installations with a relatively small 7 number of lir'st'grou'p selectors are avoided.

' Sennore chziraeteristic features of th'ei'n vention will be explained with reference to thedrawing in which aconst'ruction accord-i in'g tothe invention s illustrated-by wayjo'f example.

E e. 1 shows the plan view'oi the setting i r end Fi SZ-its back view, Fi 3 is ;ew of the leverinechanlsmstopping time necessary for establishing a connection disc'fltensteps of equal form an'd height secured number discs 11 which" showjthe setinto the a-wire' is dependent upon the post (n-wire (Figures 3 parts being'broken off; p 7 I l-T-h'e-mechanisrn' for "sett ng the number to be calledup (Figsl and 2) is niountedon a" disel' which, 'in' the construction illustrated, constitutes the front'wall of the casing r is rotated by the wheel 2 of the -geart'or the impulses in' the b-wire through the gear wheel 3" connected to the disc. The gear wheels 2 ends are of the same diameter, so;

that the disc-l makes one complete revolution during the running oi the gear to the end of its movement, as will be seen tron lowingidescription; To the disc 1 is 1r l v secured a "seconddisc which is provide f nearits circumferencewith pins 5, 5a, -5Z),' thej number of which is equal" to :the' number of places oft construction illustrated, the number of subscribers is ass'uinecl to be one million, and therefore siX pins are provided. :The pins 5a aind 5'b are at a greater distance apart the-n the other pins, the distance apart of which is thesame'Q Between-the disc '1 and the disc e are arranged *carn discs Gwhich for the. pnrr pos' e ot setting canbe turned-by ineans ot'the buttons 8. On the circumference of each cain I provided,corresponding to the number 0 to 91 The cam discs 6 are held in the position 'adg justed bf ineans ottt lccking device 9, 10.

T0 thespindles Tet the cam; discs'ere tins" ofthe cam discs through the windowslQ.

v ihefgears'which produce the iinp'ulses in the aa'nd'bvwire are locked and released 1 v the pins 5. The number otiinpulses eniitteL I tion of thegcain discs 6.] r

The producing-gear for theiinipulses-in the? and 5 comprises the toothed wheel 12 secured to the spindleof the spring casing, es well as the 'toothed wheels ef highest call nuinbe'r. In the 5 13, 14, 15, 1e, 17, 1s, 19 and the blade 20 acting as speed regulator. The gear is normally locked by a wing or blade 21 which is secured to the spindle aof the toothed wheel 15 and prevented from rotating by a projection 22 of a lever 23. The lever 23 is rotatable about a spindle 24 and controlled by a spring 25 which tends to turn it downwards. This rotation is prevented by a locking hook 28 which, under the action of pressure'of a sprin 29, engageswith the teeth 27 of the lever 23. Two teeth 37- on the spindle 15aof g the toothed wheel 15 co-operate with the teeth secured an arm 34, the bent end 34a of which,

when the lever is turned, strikes against one of the steps or teeth 39 of the cam disc 6. 7

The contact gear of thea-wireisconstituted by a spring controlled lever arm 35, and by pins 36 on the toothed wheel 14 (Fig. During the rotation of the toothed wheel 14, the arm is moved like av'pawl sliding over a ratchet wheel, and slides during that movement over the pins '36. Each touch causes an impulse to be emitted'into the a-wire. I i

When the disc 4 is rotated in the direction shown by the arrow (Fig. 3) one pin 5 is brought into engagement with the bent end 330i the lever arm 32, and raises the same. In this way, the-pawl 26 and by the extension 26a also thelockingflhook 28' is turned. The toothed part 27 and consequently the lever 23, is now free and-under the, action of 1 the spring 25 swings downwards, so that the blade 21 is disengaged from'theprojection 22. The down movement of the lever 23 is limited by the arm 34, the end 34a of which comes to rest on one. of the steps- 39 of the cam disc 6. The turning of the pawl 26 results in the lever 30, engaging bymeans of its extension 30a with the recess 26?; being also turned, so that its pointed end is brought I intothe path of movement of the blade 20,

. owing to which the running of the gear is prevented in spiteofthe factthat there is no locking at 21, 22. As soon as the lever32 drops off the pin 5, the lever 30 returns to its initial position, whereby the locking of the blade "20 iscancelled.

The gear can now run, the pins 36. passing in front of the lever arm 35, owing to which impulses are produced in the a-wire; iThe running of the a-gear also causes thetoothed member 23 to be turned back,a s the teeth 27 of the latter are engaging with the two teeth 37on the shaft of the blade 21. The number of impulses depends on the position of the cam disc 6, as the latter determines the eXtent of deflection of the toothed member 27. The. greater thedistance of the respective step cream 39 chosen by the setting from the centre oi the disc 4, the smaller the angle to which the member 27 can be turned from theinitial position when the extension 34a is resting on the step 39 of the cam disc 6, to the final or end position determined by the engagement of the blade 21 with the projection 22, and accordingly the smaller will be the number of revolutions which the spindle of the toothed wheel 15 or of the teeth 37 can make, and consequently also the spindle of the wheel 14 carrying the contact pins.

The gear for the impulses in the b-wire (Figure 5) is driven by a toothed wheel 40 on the spring casing, which transmits the movement through the toothed wheels 41-47 to the blade acting as speed regulator. The locking ofthe wing or blade 50 is effected by means f-of an arm 52 (Fig. 3 of a lever rotatable at 54', the other arm 53 of which,

in the position of the parts shown in Figure 3, by means of an extension 55 rests on the lever 23, whereby the arm 52 is held out of engagement with the blade50 in opposition to the action of a spring. The gear can thus ZFWHG, ow-

run and produces impulses in the 111g to an arm 51 secured in an insulated manner. to the framework and connected to s the b-wire en 'a in with pins 57ofthe 5 b D b .v.

wheel 42 (Fig. 5). As. after the impulses.

have been sent into the a-wire, only one single impulse is sent into the b-wire, the drivmg, gear must be stopped'again after each contact.;i-This is done by meansof one of the pins 5 on the discl, which pin turnsthe lever-'32. In ,thisJway, as will have been seen from the preceding description, the lever 23is also turned, and therefore theengagement between 55 and 23 is ceased. =The arm 52 can now swing and is by the action of the spring controlling it'brought into the path of ,movementlof the blade 50, which is locked thereby, owing to which the gear for sending 1mpulses to the b-wlre is prevented from running. The sliding ofi'of the, lever '32 fromthe pin 5 further results in the locking 30, 20.

being cancelled,so that the a-gear begins to p run at the moment of stoppage of theb-gear.

When after the runoff the a-gear has been completed, the lever 23 is brought back again to an initialposition, it engages ,with the extension .5 5,- owing to which the locking at 52, 501s undone. .The b-gearwillthen'run untilZ-the lever 32 slides on from the next pin 5. Thetwo gears therefore release and lock each other. Whilst however, the time of running of the bgearis constant,las it is operative during the movement of the disc 1 tothe angle which corresponds to the dismesses Y tan'ce between twopins 5,-the: time of run ning of the a-gear varies withthe position oft-he cam (11508 6.

At each operat on of the-impulse emitter,

the disc 4 makes one complete revolution.

Accordingly, the toothed wheel Zoo-operat ingwith the toothed wheel 3 of the same size, must only rotate 0nce,"wh1ch isensuredjinthe following manner. On the spindle of the toothed wheel 2 is mounted adisc 58, with the recess 59 of which engagesa lever 60. On one face otthe lever is provided-aprqection 61'which prevents the b gear from ruimin'g,c 21S-1tissituated in the path of 'moveinent of a pin 62 on the wheel std" and therefore locks the gear.

an adj iistablespindle 64 which is-heldin' position by a spring'63. The end of thespin'dle has an arm 65 (Figs; 3 'and- .4) which rests on a discshaped enlargement 70a ota sleeve 70. This enlarged part 70a rests on ratchet wheel 66, provided with a downward e'nlarg ing slot 67 with which engages a pin '68 of the spindle 69-.' 'The spindle 69 is mounted in the sleeve -70, which is supported by a fixed piece of tube 71. A spring'72 rests on a flange 73 of; 3 the spindle 69, and also on'thesleeve 70,-holds the pin 68 in engagement with the slot 67 of n which under the action of a spring 7 the cam slots 67'with the pin 68.

the ratchet wheel 66. T he rotation Of the lat ter and of the spindle'69 to which is secured the gear spring, is eftecte'db'y'theswinging movement of a lever 74 to be moved to and fro by hand and provided witha pawl 75, 7 engages with said ratchet wheel66; '1 r *The gear spring mounted on the shaft '69 is set by actuatingthe'lever'ituntil the cir,-'

cumterenti'al force is so great that the ratchet wheel 66'overcomes the'tens 'on of the spring 72and is lifted owing to the co-operation of With the ratchet wheel 66 is also moved the arm 65 resting on theenlargedpart'TOa and the lever 60.;the projection 61 of which releasesthe'f pin so that the la-gear is 'free'to'run. lVhen after making onerevolution the pin 62 again reaches the position of the projection 61,-it is no longer prevented by the latter fromturn- ,ing, as the lever haspassed in the meantime from the recess 59 to the plain circumference of the disc 58. Only when this disc has made a complete revolution, thelever-6O engages againwith therecess59 and locks the Zi-gear which is then released again only by a renewed operation of the hand lever 74. v1

TWhen the lever 60 moves tot'hej plain'cir cuinference of the disc 58, simultaneously 1 also the arm'65 ,1S turned,-as t is mounted on the-same spindle 64. Thereby it'encounters a "pin 78 on the pawl 75, which ,therebyiis turned and thrown out of engagement with the ratchet wheel 66. Swinging the hand "lever 7471s therefore inoperative-daring the running of the gear. I

For pursuing the action: of the :apparatus 3 The lever 60 is mounted on it may be assumed that the connection with V the subscribers zstation No. 795,316} ought to be efiectedz For this purpose the 'cain discs 6 are by means of the' buttons8 turned so that the' numb'erfdiscs- 10 show" the said desired number;-

Now thelever/Yfl is actuated and' thereby the spring mounted on the shaft 69 is woundjup; "When the tension ofthe r spring will have reached a certain value, the le've'r and the lever 60 connected to it are lifted, so that the-projection 61 and the pin 62onthe'wheel42 will disengage. Thea?)- gear-is nowtreeito turn," asthe lever 52 is out otthe path of movement of theblade 50, the a-gea-r beihg'fineanwhile prevented from" running by't-he projection 22 'ot the lever '23. i i

.' Owing to the runlofthe' b gear the arm and one impulse is a. pin 57 01"? thewheel 42 sent into the- :h-w'ireg By thee-gear also theldisc leis turned, the pin '50 of which atter emission of the first b-impulsewiH act on the lever 33. The

turning of. thelever 33 'causes: also'the lever" 28 to'turn; which sets tree the toothed lever 23, sot-hat the-latter will swing downward until nsion S la-will strike 'ag ainst'the disc 6. During the swinging movement of impulses into the (z-wire. 1 During this run of'the a gear the lever28 will; owing tothe engagementot the-teeth otth with the teeth 27, be moved back a,

0 its initial positiom which is attain the blade 21 wilhbeagain in engagement with theprojection 22. Thec-gearis there by locked, whilst the b-gear is free to run, as the-lever 23has' turned the arm 52,whih

thus is p nt: out of thepath of movement of the'blade 50.; The-b-gear can nowrunnntil.

the next pin will engage with th 'lever whereby again one sin l causesthe a-gear torun again.

ed, when e impulse is sent into the -b wire. lhe turning of the lever 32 The num-.

be'r'ot impulses emitted in the a-wire depends.

upon ne position otthe cam discs 6 which is such, that after the first b-1mpulseTa-1m- 1 pulses are em1tted,atter the second hatter the thirdii, atterwthefourth after the fitthland after the sixth 6. a v

, hen-all the impulses are emitted into the a-wire as'well as'into'the h-wire, the-wheel? 58 with-the recess 59-will have coi'upleted one revolution. i The lever 60', which by the'circumference'o't the d sc 58 had been'lzept in its lifted position, nowengages with'the' recess v59,'wh'ereby thegexteusion 61V is brought to engage -with ;the:';pin" iii-landthei brgear is locked. r-Fon-set'ting the-apparatus ;;to work 'theother end is intended in one position (that shown in the drawing) to connect electrically two contacts 86 and 87 secured .to and insulated from the framework, which con? tacts do not touch each other after the lever has been turned. Of the said contacts, the.

contact 86 is'connected to the a-wire leading to the telephone instrument, and the contact 87 to the a-wire leading to the exchange. The

disc 85a, 85b is mounted on the same'spindle as the disc 58, and like the latter, makes one complete revolution at each operation of the impulse emitter. 'It is built up of two parts 85a and 85?) which can be turned separately and fixed to one another. Each part is pro-, videdonthe circumference with a recess, the depth of which is such that the nose, 8% does not touch the disc. During the rotation of the disc 85a, 85b in the direction indicated by the arrow, the nose 84 of the lever 81 is 7 brought into engagement with the face 89 of the recess of the disc 85a, and is raised by the same to the circumference of the discs, owingto which an electric connection is made between the lever part 81a and the disc 85;

The connection is broken again-as soon as the nose 84 slidesofl from the edge 90 of the recess of the disc 85?). By adjusting the disc 85a, the nose 84. may be made tocontact with the disc circumference, and the electric connection to the lever 81a effected at an earlier or later moment;

' For explaining the operation, let it be assumed that the impulse sender which is arranged for use in a telephone installation with several hundred thousands of subscribersis to be used in an installation with only several tens of thousands of subscribers. In accordance with the smaller number of subscribers,

the disc 85a is set in such a manner that the j nose 84 of the lever 81 engages with the circumference of the discs 85a and 85?) only when the disc 1 has made one sixth of a com plete revolution.

The gear spring is now wound up by means of the lever.74, until the locking of the b-gear at 61, 62 is cancelled by the movement of the lever 60. As soon as the j 0 gear begins to run, the disc 1:is also rotated.

Owingto the running of the b-gear, a contact is produced between 51, 57wh1ch however remains inoperative, asthe earth connection has not yet been made.- After thelever 32 has dropped off from the first pin 5a, the gear for the b-impulses is locked by the arm 52. The.

gear. for-the impulses in the a-wire now runs to the extent determined by the position of the corresponding cam disc 6, until the blade 21 comes in engagement with the projection 22, but these impulses also remain inoperative, as the first contact of the b-wire has not taken place. The nose 84 now comes on the circumference of the disc 85a,85b and the lever 81a, 81bis'turned, owing to which the electric connection between 86 and87is broken and the disc 85a, 85b connected to earth by the lever arm 81a. The next impulse in the b-wire wilhtherefore be operative. Owing to-flthe sliding off of thelever 32 from the second pin 5, the gear for the 'b-impulses is locked again.

- Impulses follow in the wwire, the number of which is determined by the position of the second cam disc. The'same thing is repeated six times, whereupon the lever again en-- gages with the recess 5 9 of the disc 58 and locks the b -gear at 61, 62, which is released again only by .a fresh-operation of the lever 74.

If the impulse emitter is to be used for installations for several hundred thousands of disc so as. to ensure that the lever 81 will be raised atthe beginning of the run of the gear. a I p I v If the installation contains a relatively small number of first groupselectors, the use of the device described is liable to lead to the disadvantage that wrong connection might be made owing to the first group selector which at the moment of the arrival of the first impulse, of the series is still engaged, but shortly afterwards becomes free and available, being reached not by the first impulse of the a-wire, but only by a later impulse, certain impulses intended for lower place values .90 subscribers, it is merely necessary to turn the no longer becoming operative at all. This disadvantage is eliminated by the construc-.

tion of the device shown in Figure 6, in which the gear remains locked .until a free first group selector has been; found.

106is a lever turning on the -s indle 100,

theend 106a; of which lever ig. 5) is brought within the path of movement of the blade 47, when the lever is turned. The other endl07. of the lever constitutes an armature acted upon by an electro=magnet 108. 102 is an extension ofthe lever, which by a spring acting on the lever is pressed against the.

circumference of the discs 85a, 85?). 104i is '0 a pin on the disc 85a and 105 a spring, connected by means'of an electric wire to the winding of the 'electro-magnet 108, the other end ;of which winding is connected to the a-wire leading tothe exchange. V

The end 106a ofthe lever'is, when the 6 gear begins to run, situatedoutside'the path of movement of the blade 50. If the disc-85a,- 856 has turned'so far, that the extension 102 I can engage with therecess ofthe disc, the lever 106 is turned and the blade50 locked. 7

' memes But thislocking can only take: place, whenno first group selector is free. If at themoment, in'whicli the extension 102 had the possibility of dropping into therrecess of the discs 85a, 85?), a first group selector was" free, electric current was supplied from the exchange to the electro-niagnet 108, as at this position 1 the pin 10% touches the spring 105. v The elec-p receiver had not been taken 05 before the gears have ceased torun. Thisdevice islconstituted by. a contact connected to the b-w re and made in the form'ota key 110, the lateral face- 1'11 of which is provided with an insulating covering. When the lever portion 81b is turned owing to the nose 8% sliding on to the circumference of the disc 85a, 85?), the end of this lever portion slides on the insulated covering 111. During the return movement of the lever 8164,81?) whichtakes place after the gears have accomplished their run, owing to the projection Set en ing again with the recess of the disc 85a, 8 5 7)? the end of the lever portion81b comes into contact with the noninsulated lateral face otthe key 110,0wing to which a connection will be established be tween the (rand-b wires. In orderto avoid any: disturbance in emitting the impulse by the lifting vof the telephone receiver, there isfprovided in thee-wire to the telephoneinstrument a'break or interruption 86, 87 which for locking the said is short circuited by the lever portion 81'?) only after all the impulses have been sent.

If the receiver had been taken ottbefore,the

circuit to the telephone instrument will be interruptedby this'break in the a-wire';.

What'is claimed is:

1. An impulse emitter for telephone ex changes adapted to be connected in circuit with two branches of the line including a plurality of separate circuits comprising a contact wheel adaptedior emitting impulses into the one branch of the line, a gear dri'v- V v s rahty of separate c rcuits comprisin a contact wheel adapted foremittingiinpulses into the one branch of theline a second contact ing said contact wheel, an oscillating element gear, means for releasing v the said'loclging element, a second contact wheel adapted for emitting impulses into the second branch of the line, a second gear driving this second contact wheel,and means for locking and releasing the second gear.

2. An impulse emi ter for telephone eX- changes adapted to be connected in circuit with two branches of the line including a ph rahty ofseparate; circuits comprising a contact wheel adapted for emlttlng impulses into-the one branch of the line, a gear driving said contactwheel, an oscillating element for locking the said gear, means for releasing the saidloclring element, a second contact wheel contact wheel adapted for emitting 1 changes adaptedi tobe connected 1 adapted for emitting impulses into the sec- 0nd branch of the line, asecond geardriving this second contact wheel, and means for;

locking and releasing these'co'nd gear, which means are connected with themeans for-locli-;-,

ing the firstgear whereas the means for releasing the first gear, are connected to: the

second gear.

SMAn impulse emitter for telephone "exchanges adapted. to be connected in circuit with two branches of the line includlng aplureality of separate circuits comprising-a contact wheel ada )ted for emittin impulseslinto V V b r r locking element, ii a second contactwheel, a gear for dr ving this second contactwheel,

means for locking and rele'asingjthis second gear and a spring drive, the shaft of which i is connected to the first gear while its casing is. connected to the second gear. I

trAn impulse emitter for telephone ex' changes adapted to be connectedjin circuit with two branches of the. line in l a.

pluralityQof separate circuits CO1 into the one branchot the line, arse cond contact v wheel adapted for emitting impulses into'thesecond branch of the lincs rears for driving said contact wneels alternatclv and means torlocking the second gear atter emission of all the impulses.

5. 'An' impulse emitter for telephone e);-

changes adaptedto be connected in circuit.

with two branches ofthe line including a plurality of separate circuits" comprising contact wheel adapted for emitting impulses into the one branch of the line, a second con tact wheel adapted for emitting impulses into the second branch of the line, gears for driving said contact wheels alternately, a lever for locking the second gear latter emission of all theimpulses, andmoans iormaintain ing this lever-inthe non operativc positio-n during the run. 7 a v V 6. An impulse emitter for telephone e2;-

changes adapted eto be connected in circuit with two branches of the line including a plusecond branch of the, line, gears tor-drivingsaid contact wheels alternately,a lever ioo for locking the second gearafter emi in-not all the, impulses, anda disc for ma at nm g this lever'in the non-operativeposition dur-l ringthe run.

7. Animpulscemitter tor telephone e1:-

. circuit with two branches of the lin including a plu. rality of separate circuits compr a contact-wheel adapted forei ting impulses into V the one :b ranchlof the'line, a'secondicontact Wheel adapted for emitting impulses into the second branch of the line, gears for driving said contactwheels alternately, a lever for i locking the second gear after emission of all "the impulses, and means for releasing this lever connected to the device for ten'sioning the spring driving the gears.

8. An impulse emitter for telephones changes adapted to be connected in circuit with-two branches of the line including a plurality of separate circuits comprising a wheel after emission o'fall the impulses, such changes adapted to be connected in circuit lever being connected to a slidable coupling element of the device for tensioning. the spring driving thegears, V v

9. An impulse emitter for telephone exwith two'branches of the line including aplurality of separate circuit-s comprising a contact Wheel adapted for emitting impulses into the one branch of the line, a second contact wheel adapted for emittingimpulses into the second branch of the line, a first gear and a second gear for driving said contact Wheels, a lever for locking the gear driving the second contact wheel, and an electromagnet for controlling the locking lever connected on the one hand to the branch of the line leading to the exchange and on the other to a contact-element ,on a disc rotated by the second gear. 4

10. An impulse emitter for telephone exchanges adapted to be connected in circuit with two branches of the line including a plurality of separate circuits comprising a contact wheel adapted for emittingimpulses into the one branch of the line, a second contact wheel adapted for emitting impulses into the second branch of the line, a firstgear and a second gear driving said contact wheels, a lever for locking the second gear, an

electro-magnet for controlling the locking lever, and a disc for locking the locking lever.

11.,An impulse emitter for telephone ex plurality of separate circuits comprising a contact Wheel adapted for emltting impulses into the one branch of the'line, a second contact wheel adapted for emitting impulses into the second branch of the line, gears for drivingsaid contact wheels, a lever connected to earth and a disc adapted for controlling said lever, which disc is provided with a recess and is rotated byflthe gear driving the second contact Wheel.

12. An impulse emitter for telephone exchanges adapted to be connectedin circuit meshes,

with two branches of the line including a plurality of separate circuits comprising a contact-Wheel adapted for emitting impulses into the one branch of the line, a secoi1'd,

contact Wheel adapted for emitting impulses Y into the second branch of the line, gears for driving said contact wheels, a lever connected to earth and two discs adapted for controlling said lever, 'Wl1lCl1 discs are provided each one with a recess and adj ustably connected to one another. 1

13. An impulse emitter for telephone exchanges adapted to be connected in circuit with two branches ,of-the line including a contact Wheel, and adapted to be connected to the one branch of the line receiving its impulses from the first contact wheel, and

a key-shaped contact member with one insulated face lying on the path of movement lot the said lever.

14. An impulse emitter for telephone exchanges adapted to be connected in circuit with two branches of the line including'a plurality of separate circuits comprising a contact wheel adapted to emit impulses into 1 one branchot the line,"a gear-driving said contact Wheel, and an osc llating element 'for locking and releasing the driving gear,

said element being provided with teeth adapted to engage with the teeth of a driv-- ing Wheel of the said gear.

15. An impulse emitter forv telephone exchanges adapted to be connected in circuit with two branches of the line including a plurality of separate circuits comprising a contact wheel adapted to emit impulses into ing and releasing the driving gear, said element-being provided with teeth adapted to engage with the teeth of a driving wheel of the said gear, and means for locking the oscillating element. 7 I

16. An impulse emitter for telephone exchanges adapted to be connected in circuit Withtwo branches of the line including a plurality of separate circuits comprising as contact wheel adapted for'emitting impulses intoone branch of the line, a gear driving sald contact wheel, an osclllatmg element for lockmgand releasing the driving gear,

'one branch of the line, a gear drivingsaidm contactwheel, an oscillating element for locksaid element being provided with teeth adapted to engage with the teeth of a drivingwheel of said gear, m eans for locking the oscillating element, and means for limiting the amplitude of oscillation of said element.

17. An impulse emitter for telephone ex 7 changes adapted tobe'connected in circuit with two branches of the .line including a plurality of separate circuits comprlsing a contact wheel adapted to emit impulses into one branch of the line, a gear driving said contact wheel, an oscillating element for locking and releasingthe driving gear, said element being provided with teeth adapted to engage with the teeth of a driving wheel of said gear, means for locking the oscillating element and discs with tooth-like cams for limiting the amplitude of oscillation of said element, mounted on an intermittently rotating disc.

ed on an intermittently rotating disc.

- 22 An impulse emitter for telephone ex changes adapted to be connected in circuit with two'branches of the line including, a

plurality of "separate circuits comprising a contact wheel adapted for emitting impulses into one'branch of the line, a gear driving andineans for releasing the said lever mount said contact wheel, an oscillating-element for locking and releasing the drivinggear, means for locking the oscillating element and a lever adapted for locking and releas ing the driving gear, and connected'to the saidmeans for locking the oscillating ele ment.

In testimony whereof I have aifixed my 7 signature. V a V ANNA DOMASCHKO, Admvlnistmtm'm of Andreas Domaschko, De-

ceased. y l i 19. An impulse emitter for telephone exchanges adapted to be connected in circuit with two branches of the line including a plurality of'separate' circuits comprising a contact wheel adapted to emit impulses into one branch of the line, a gear {driving said contact wheel, an oscillating element for locking and releasing the driving gear,

said element being provided with teeth adapted to engage with the teeth of a driving wheel of the said gear, means for locking the oscillating element, discs with toothlike cams for limitingthe amplitude of oscilc lation of saidfelement mount-ed on an intermittently rotating disc, and means for set ting'the cam discs.- i V 20. An impulse emitter for telephone exchanges adapted to be connected in circuit with two branches of the line including a plurality of separate circuits comprising a contact wheel adapted for emitting impulses into one branch of the line, a gear driving said contact wheel, an oscillating element for locking and releasing the driving gear, a lever for locking the oscillating element, and melans for releasing the said lever'at interva s.

21. An impulse emitter for telephone exchanges adapted to be connected in circuit with two branches of the line including a plurality of separate circuits comprising a contact wheel adapted for'emitting impulses into one branch of the line, a gear driving said contact wheel, an oscillating element for locking and releasing the driving gear, a lever for locking the oscillating elements, 

